Condenser winding machine



Aug. 31, 1943. c. s. WEST CONDENSER WINDING MACHINE Filed May 28, 1940 2 Sheets-Sheet 1 Inventor: CHF'FQTd S.West,

b His Attorneg.

Aug. 31, 1943. c, 5. WEST 2,328,520

CONDENSER WINDING MACHINE Filed May 28, 1940 2 Sheets-Sheet- 2 Fig. 2.

FOIL

TAP STRAP InQentoT: Clifford S. We st,

His Attovneg.

Patented Aug. 31, 1943 CONDENSER WINDING MACHINE Cliflord S. West, Adams, Mass., assignor to General Electric Company, a corporation of New York Application May 28, 1940, Serial No. 337,615

8 Claims.

The present invention relates to machines for automatically winding electrical condensers of the coil type.

The object of my invention is to provide an improved construction and arrangement in machines of this type for inserting or positioning the tap straps, conducting leads or terminals, and for a consideration of what I believe novel and my invention, attention is directed to the following description and the claims appended thereto.

In the accompanying drawings, Fig. 1 is a diagrammatic view of a condenser winding machine embodying my;invention; Fig. 2 is a front elevation of the tap strap ejector; Fig. 3 is a top plan view of the tap strap ejector; Fig. 4 is an end elevation of the tap strap ejector; Fig.5 is "a sectional view on line 5-5 of Fig. 2; Fig.6 is a sectional view on line i- -Ii of Fig. 2; Fig. 'l 'is an end elevation of a modification of the tap strap ejector; and Fig. 8 is a diagram illustrating the movement of the tap strap after ejection.

My invention is shown as being embodied in a condenser winding machine of the type shown in application Serial No. 304,787, filed November 16, 1939, now Patent No.;2,255,498, issued September.9, 1941. The condenser is wound on a split mandrel I mounted on a shaft 2 driven by an electric motor 3 by means of abelt 4 running over a pulley 5 fixed to the motor shaft and a pulley 6 fixed to the mandrel shaft. Power is supplied to the motor through line conductors 1 and 3, the line conductor 1' being connected to the motor through a conductor 3 and the line conductor 8 being connected to the motor through conductor I 0, normally open contacts II of a solenoid IIa, conductors I2 and I3, resistances I4 and I5, and conductor I6. The resistance I4 is normally short-circuited through the normally closed contacts I! of a solenoid I3, the contacts being respectively connected by a conductor I3 to the junction of the conductors I2 and I3 and by a conductor 23to the junction of the resistances I4 and I5. When the resistance I4 is short-circuited, the motor runs at full speed. When the resistance I4 is open-circuited by the energizing of the solenoid I8 to open the contacts I], the additional resistance inserted in the motor supply circuit causes the motor to run at a slower speed.

The motor is started by a manually operated switch 2| connected in the circuit of the solenoid I Ia. The solenoid is energized from a low voltage supply comprising conductors 22 and 23. One side of the switch 2I is connected by a conductor ,switch is connected to the solenoid Ila extending: from the conductor 22, throughthe conductor .24, through normally closed contacts 21 of a solenoid 23, through contacts 26 to the solenoid I I a, and from the solenoid through conductor 25 to the supply conductor 23. As soon as the solenoid I la has been operated the switch 2I may be opened and the solenoid will be held in its closed position due to the establishment of the holding circuit described above. The motor is stopped by energizing the solenoid 28, opening the contactsll, and breaking the holding circuit for the solenoid IIa. As soon as this happens the solenoid Ila returns to the position illustrated in which the contacts I I and 26 are open.

The condenser comprises layers of foil with interposed layers of paper. The paper is fed to the mandrel from rolls 29 rotatably carried on spindles 30. The paper passes to the mandrel over guides 3| and between paper feed rolls 32 and 32a. The foil is ted to the mandrel from rolls 33 rotatably carried on spindles 34. The foil passes to the mandrel between foil feed rolls 35 and 35a and also between the paper feed rolls 32 and 32a. Stationary guides 33 are arranged below the feed rolls 32. Thefeed rolls 32 and 32a and 35 and 35a are normally separated and, in such position, are ineffective to feed the paper or foil even though rotated. The paper and foil, accordingly, are unwrapped from the respective rolls and wound on the mandred at a speed depending upon the diameter of the paper and foil wrapped on the mandrel, and the R. P. M. of shaft 2.

The paper and foil feed rolls are driven by a chain 31 which is driven by the motor through a gear train comprising gears 38, 39, 40, and 4| by means of a belt 42 running over the pulley 5 fixed to the motor shaft anda pulley 43 fixed to the gear 4|. The speed at which the chain is driven is accordingly directly proportional to the motor speed and adjustably selected so that paper and foil will be fed at a rate approximately equal to the speed of the dielectricat the end of the winding. The paper feed rolls 32 and 32a are driven from the chain through a gear 44 fixed to the shaft 45 of the roll 32 and through gears 46 and 41 respectively fixed to the shaft 45 and to the shaft 43 of the feed roll 32a. The

, to the right.

gears 44, 46 and 41 are of the same size, and the rolls 32 and 32a accordingly are positively driven at the same speed and in opposite directions. The foil feed rolls 35 and 35:: 'are driven by gears 49 and 50 fixed to the feed roll shafts Fixed to'one of each pair of the feed roll shafts is a gear 52 meshing with the chain 31. The gears 43, 58, and 52 are of the same size as the paper feed roll gears 44, 46, and 41, and the foil feed rolls are accordingly positively driven in opposite directions at the same speed as the paper feed rolls. Since the feed roll speed is fixed, the surface speed of the feed rolls may be greater or lessthan the surface speed of the condenser coil being wrapped on the mandrel, depending upon the diameter of the condenser being wound.

Preferably the feed roll speed is such that the paper and foil will be fed by the respective feed rolls at a speed substantially equal to the speed of the paper at the end of the winding.

The paper feed rolls 32 and 32a are rendered effective to feed paper toward the mandrel by moving the roll 32 into engagement with the roll 32a. This is effected by means of a solenoid 53 connected to one end of a bell crank lever 64 pivoted at 55. The other end of the bell crank lever 54 is connected to a slide 56 suitably guided in a manner not shown and journaled on the shaft 45 of the roll 32. When the solenoid 53 is energized, the bell crank lever 54 is pivoted in a counterclockwise direction about the pivot 55, causing the slide 56 to bemoved toward the roll 32a and moving the roll 32 into engagement with the roll 32a. When the solenoid 53 is deenergized, the parts are returned by gravity to the position illustrated in which the roll 32 is separated from the roll 32a.

The foil feed rolls 35 and 35a are rendered effective to feed foil toward the mandrel by a solenoid 51 connected at its lower end to a block 58 on which are pivoted the inner ends of links 59. The outer ends of the links 59 are pivotally connected to slides 68 suitably guided in a manner not" shown and respectively journaled on the.

shafts 5! of the rolls 35. When the solenoid 51 is energized, the inner ends of the links: 59 are lifted, causing the outer ends of the links to move toward the shafts of the rolls 35a. The slides 68 "connected to the outer ends of the links 59 accordingly move the rolls 35 into engagement with the rolls 35a and render the rolls effective to feed foil toward the mandrel. When the solenoid 51 is deenergized, the parts are returned by gravity to the position illustrated in which the rolls 35 are separated from the rolls 35a.

Below each of the foil feed rolls 36 and 35a are cutters each comprising a stationary cutter blade 5! and a rotatable cutter blade 62. The foil is cut by rotation of the cutters 62 to a position cooperating with the stationary cutters 6|. This is effected by means of a solenoid 63 having a rack gear 65. The gears 69 are fixed to the shafts 18 64 meshing with a pinion 65 loose on shaft 65a. A

ratchet described in the above application con nects the pinion 65 and the shaft 654: so that the shaft is rotated when the rack 64 moves to the left and remains stationary when the rack moves The solenoid is biased to the position illustrated by a spring 66 connected to the free end of the rack 64. When the solenoid 63 is energized, the rack 84 is moved to the left, causing the gear 65 to be rotated in a clockwise direction, as viewed in Fig. 1. The ratchet is then effective to rotate the shaft 65a in unison with the gear 65, causing the cutters 62 to be rotated through gears 61, 68, and 69. The rotation of the carrying the rotatable cutters 62. When the solenoid 63 is deenergized, the rack 64 is moved to the right by the spring 66, returning the rack 64 to the position illustrated. During the return movement of the rack 64, the shaft 65a remains stationary since the ratchet is ineffective during the reverse rotation of the gear 65. The cutters 62 accordingly remain stationary.

Below the stationary guides 36 are paper cutters comprising rotatable knives II fixed to shafts 12. The knives H are rotated in opposite directions by gears 13 fixed to the shafts 12, one of the shafts being rotated by a rack 14 meshing with a pinion I5 connected thereto by a ratchet drive of the same construction as that used in the foil cutter. One end of the rack is connected to a solenoid 16, and the other end of the rack is connected to a tension spring 11 biasing the rack to the position illustrated. When the solenoid 16 is energized, the rack 14 is moved to the right, causing the knives H to be rotated in opposite directions a half revolution to sever the paper. When the solenoid I6 is deenergized, the rack 14 is returned to the position illustrated by the tension spring 11. The cutters remain stationary during the return movement of the rack due to the ratchet connection between the shaft 12 and the pinion I5.

Below the foil cutters and between adjacent strips of foil and paper are tap strap ejectors 18 shown in detail in Figs. 2 to 6 inclusive. The

front wall of a rectangular recess 86a receiving a stack of tap straps or terminals 81. Tap strapsare tinned strips of copper or other suitable conducting metal having a length somewhat greater than the width of the foil adapted to be arranged between the foil and paper with the ends projecting to serve as leads for making connections to the condenser. The stack of tap straps is urged toward the bottom flange 8i by a pressure bar 88 slidable in the recess 86a. The pressure exerted by the bar 88 is derived from coil springs 89 arranged between the upper side of the bar and a plate 90 fixed to the top of the flange 88. The lower ends of the springs are arranged around studs 9| threaded in the bar 88 and the upper ends of the springs are arranged in sockets 92 in the flange 88. The studs 9| and the sockets 92 prevent buckling of the springs. On the lower surface of the pressure bar are projections 93 which, as shown in Figs. 4 to 6, are inclined upwardly from the front plate 86 toward the back each of the projections 93 is a pair of rubber faced friction rolls 94 fixed on a hub 95 in turn fixed to a shaft '96 rotatably carried in bosses 91 on the under side of the bottom flange 8|. The v center of the shaft is toward the front plate 00, and is preferably arranged so that the center of the contact of the wheels 04 with the bottom of the stack of tap straps is from 15 to 25% from the front plate 06, or, in other words, from '15 to 85% from the back wall 10. The tap straps accordingly are squeezed together at the front edges between the projections 03 and the rolls 04 and the rear edges, which are subjected to practically no pressure, fan" or broom outward, as shown in Figs. 4 to 6. The brooming of the strips, which is an important feature, is also obtained in part from the inclination of the projections 03. This inclination is of the order of from 2 to 8 from the horizontal. When the rolls 04 are rotated iin a clockwise direction, as viewed in Fig. 4, the

lowermost tap strap will be frictionally gripped.

by the rubber surface of the rolls and propelled through the slot between the lower edge of the plate 00 and the upper surface of the flange 0i. Throughout the greater portion of the length of the tap strap ejector this slot has a width equal to the thickness of several tap straps. Directly above the friction rolls 04 the slot is limited to a width slightly greater than the thickness of a single tap strap but less than the thickness of two straps by adjustable gauge plates 00 vertically slidable in recesses in the front face of the plate 06. The gauge plates are held in the recesses by screws 00 threaded into the plate 06 and extending through elongated slots I00 in the gauge plates. The vertical position of the gauge plates is adjusted by adjusting screws IOI having heads I02 fitting in circular openings I00 in the plate 90. The heads I02 are provided with circular flanges I04 which fit in circular recesses in the under side of the plate 00 and prevent upward movement of the adjusting screws. The threaded portion of the adjusting screws cooperates with threads formed in semi-circular recesses in the adjacent faces of the front plate 06 and the gauge Plates 00. Upon turning the adjusting screws the gauge plates 00 are accordingly moved up or down to adjust the slot between the rolls and the lower ends of the gauge plates to the required width. As explained above, this width should be greater than the thickness of a single tap strap and less than the thickness of two tap straps. Upon each rotation of the friction rolls 04 in a clockwise direction, as viewed in Figs. 4 to 6, a single tap strap is removed from the bottom of the stack and projected through the slot between the rolls and the lower edges of the gauge plates. This tap strap is completely ejected due to the location of the friction rolls adjacent the front plate 06. The brooming of the tap straps due to the squeezing of the front edges of the tap straps between the friction rolls and the projections 03 reduces the friction on the rear part of the tap straps and facilitates the ejection. Upon ejection the tap strap passes between guides 01a and 01!) carried by the ejector and is guided to a position parallel to the foil. The successive positions of the tap strap after ejection are diagrammatically indicated in Fig. 8. The tap strap finally assumes a position between and parallel to the strips of foil and paper and moving in the same direction as the strips. The tap strap ejector is conditioned for the ejection of a succeeding tap strap by rotating the rolls 04 in a counterclockwise direction. This operation may be either manual or automatic. In the present construction the tap strap ejector is operated by a solenoid I00 connected to one end of a lever I06 pivoted at I01 and having a segment gear I00 at the opposite end. The

segment gear meshes with a pinion I00 connected to the shaft 00. The solenoid is biased to the position illustrated by a tension spring H0. when the solenoid is energized the segment gear I00 is turned in a counterclockwise direction, turning the pinion I00 in a clockwise direction and ejecting one of the tap straps in the manner described above. When the solenoid is deenergized the parts are returned by the tension spring I I0 to the position illustrated. The operation of the solenoid may either be controlled manually by a switch III or automatically in a manner hereinafter described. For convenience, no illustration is made of the drive for the tap strap ejector at the left in Fig. 1.

The machine is controlled by mechanism driven through a friction wheel II2 rotatably carried. in a hinged arm I I3 and biased by gravity into engagement with one of the paper rolls 20. The rotation of the friction wheel H2 is accordingly a measure of the length of paper and foil fed to the mandrel. The capacity of the finished condenser is very nearly proportional to the length of paper and foil wound on the mandrel. Since both the paper and the foil vary in thickness, there 'will be considerable variation in the number of turnsof the mandrel required to wind the given length of foil paper, and there will also be considerable variation in the diameter of the finished condenser. By using the length of foil and paper wound on the mandrel to control the machine, condensers of suitably uniform capacity are obtained.

The friction wheel II2 drives control chains II4 through a speed reducing drive comprising a worm II5 rotated by a gear II6 driven by a chain H1 in turn driven by a gear IIO fixed ,to the friction roller shaft I I0. The worm I I6 drives a gear I fixed to a shaft Hi to which are fixed control chain drive gears I22. The chain II1 provides a driving connection between the friction wheel H2 and the worm II5 which is independent of the angular position of the friction wheel supporting arm H3. The drive is accordingly independent of the diameter of the paper roll against which the friction wheel bears. The control chains II4 are spaced apart along the shaft I2I. Fixed between the chains are plates I20 and I24 carrying adjustable members for controlling the operation of the solenoids effecting the various operations of the machine. The length of the control chains H4 is adjustable by adding or subtracting links to make the machine effective for winding different sizes of condensers.

The speed of the motor 3 is controiled by a member I26 on the plate I20. The member I26 cooperates with a spring contact arm I26 and raises it into engagement with a bar I21 connected to the control circuit supply conductor 23. When the spring contact arm I26 engages the bar I21 a circuit is completed to the solenoid I0 from conductor 20 through the bar I21, contact I26, and conductor I20 to the solenoid I0, and from the solenoid I0 through conductor 24 to conductor 22. This energizes the solenoid I0,

opening the contacts I1 and opening the short circuit around the resistance I4. This connects the resistance I4 in series with the motor and reduces the motor speed.

The foil cutters GI and 62 are controlled by a member I20 which cooperates with a spring contact I30 to close a circuit through the foil cut-oi! solenoid 63. This circuit extends from conductor 20 through the bar I21, spring contact s v aw *i feed of ion;

are returned by illustrated.

I30, and conductor I3| to the solenoid, and from the solenoid through conductor I32 to conductor 22. When the solenoid 63 is energized, the rack 64 is moved to the left, rotating the cutters 62 through the gears 65, 61, 63, and 69. When the member I29 moves from under the spring contact I30, the circuit to the solenoid is opened and the spring 66 returns the rack to the position illustrated, the cutters remaining stationary due to the ratchet drive. The foil feed rolls 35 and 35a are controlled by a member I33 which cooperates with a spring contact I34 to close a circuit through the foil feed roll solenoid 51. This circuit extends from conductor 23 through the bar ifi'l, contact 33, conductor I35 to the solenoid ill, the solenoid 51 through conduo-tors i 1E1 332 to conductor 22. When the is energized, the inner ends of the ms .5 are raised, thereby moving the rolls 35 against the rolls 35a and causing the foil to be fed downward toward the mandrel. The; rolls 35 and 35s, as described above, are driven continuously but are cfl'ective to feed the foil only when in engagement. When the member I33 moves past the spring contact I34, the circuit to the solenoid E50 isopened and the feed rolls'35 moved orn'the rolls 35a, stopping the The paper-cutting: knives- .1I are" controlled by a member I31 which"co'operates with'wa spring contact I38 to close a circuit throu'ghp the paper cutoif solenoid 16. This circuit extends from conductor 23 through the bar I21, spring contact arm I36, and conductor I39 to the solenoid, and from the solenoid through conductor I40 to conductor 22. When the solenoid 16 is energized, it moves the rack 14 to the right, rotating the cutter knives 1| through gears 13 and 15. When the member I31 moves from under the spring contact arm I38, the circuit to the solenoid 16 is opened and the rack 14 is returned by the tension spring 11 to the position illustrated.

The paper feed rolls 32 and 32a are controlled by a member I which cooperates with a spring contact I42 to close a circuit through the paper feed solenoid 53. This circuit extends from the conductor 23 through bar I 21, spring contact arm I42, and conductor I43 to the solenoid, and from the solenoid through conductors I 44 and I40 to conductor 22. When the solenoid 53 is energized,

the bell crank 54 is pivoted in a counterclockwise direction, moving the roll 32 into engagement with the roll 32a and rendering the rolls effective to feed paper toward the mandrel. When the member I4I moves from under the spring contact I42, the circuit to the solenoid 53 is opened and the feed roll 32 is moved by gravity away from the feed roll 32a, stopping the feed of Pap r- The tap strap'eje'ctofrs arecontrolled by a member I45 on the plate1I24.. The member I45 cooperates with a spring contact I46 to control a circuit tothe' solenoid I.- This circuit extends from conductor 23 through bar I21, contact I48 and conductor I 41 to the solenoid, and from the solenoid through conductors I43 and I40 to con-' vductor 22 When the solenoid I05 is energized,

it is movedto the left, rotating the shaft 96 and turning the, friction rolls 14 in a clockwise directionto eject'atap strap. When the member I45 moves from under the spring contact I46, the circuitito the solenoid is opened and the parts the spring IIO to the position The machine is stopped by a member I49 which cooperates with a spring contact I30 and controls a circuit to the solenoid 28. This circuit extends from conductor 23 through bar I21, contact I50, and-conductor I5I to the solenoid, and from the solenoid through conductor 24 to the conductor 22. When the solenoid is energized, the contacts 21 are opened, opening the holding circuit for the solenoid Na and deeper-- gizing the solenoid Ila. This causes the opening of the contacts, II, thereby opening the motor circuit as described above.

After being stopped through the action of member I49, the motor may be started again by momentarilymlbsing the switch 2| as described above. The switch 2| must be held closed until the member I49 has moved away from'the spring contact I50, after which the switch may be opened.

At the start of the condenser winding operation, the lowerends of the paper and foil project a short distance below the mandrel, with the ends of the paper projecting a sufllcient distance beyond the ends of the foil to provide the necessary insulation. The control member I49 is in engagement with the spring contact I50, completing a circuit through the solenoid 28, and the switehZi is open. All of'the other control members'carried by the plates- I23 and I24 are clear of the. respective cooperating spring contactsx V Before starting the operation of the machine, the operatorfirst-secures the free ends of the foil and paper between the parts of the split mandrel. Themachine is now started by manually closing the switch 2I to energize the motor starting solenoid Ilc. This closes the motor circuit through contacts I I and causes the mandrel to be rotated by means of the belt 4 and the pulleys 5 and 6, and also causes the feed rolls 32, 32a, and 35 and 35a to be rotated by the chain 31 and the associated gearing. The feed rolls are separated and accordingly are ineffective. The rotation of the mandrel winds the paper and foil on the mandrel and drives the control chains -II4 through the friction wheel II 2, bearing on' one 01' the paper rolls 29. The switch 2I is held closed until the chains II4 have moved sumciently to move the member I49 away from the spring contactv I50, opening the circuit to the solenoid 28. The switch 2| may then be opened, the circuit to the motor control solenoid Ila being now maintained by the holding circuit established by the closure of contacts 26.

At a point in the condenser winding operation determined by the position of the plate I24, the member I45 engages thespring contact I46 and closes a circuit to the tap strap ejector solenoid I05. This causes the rotation of the friction rolls 94 in a clockwise direction, as viewed in Figs. 4 to 6, ejecting tap straps. The tap straps are ejected while the condenser is being wound at full speed. Heretofore it has been necessary to stop the machine and insert the tap straps by hand. When the member I45 moves from under the spring contact I46, the circuit to the tap strap ejector solenoid is broken and the parts are returned by the spring IIO to the position illustrated.

and paper is wound on the mandrel, the member I25 on the plate I23 engages the spring contact I26 and closes the circuit to the solenoid I6, energizing the solenoid and causing the opening of the contacts I1 to remove the short circult around the resistance I4. This inserts the resistance l4 in series with the motor and reduces the motor speed, effecting a corresponding reduction in the mandrel speed. The slowing of the mandrel speed is desirable to reduce the rate of travel of the foil and paper so that the subsequent cutting and feeding operations may be performed without excessive strain. The members on the plate I23 are arranged so that the motor has a sufficient interval of time in which to reach its slow speed before any of the subsequent operations is started. At the end of this interval, 1. e., after the motor has reached its slow speed, the member I23 engages the spring arm I30 and completes a circuit to the foil cutof! solenoid 63. The energization of this solenoid causes the rack 64 to be moved to the left, thereby rotating the cutters 62 through the gears 65, 41, 68, and 63. When the member I23 moves from under the spring contact I36, the circuit to the solenoid 63 is opened and the rack is returned by the spring 66 to the position illustrated. At this time the feed of foil from the rolls 33 stops and the end of the foil connected to the mandrel continues to be wrapped on the mandrel together with the paper. After a suitable interval, during which time the end of the foil connected to the mandrel moves away from the end of the foil connected to the rolls, the member I33 engages the spring contact I34 and closes a circuit tothe foil feeding solenoid 51. The energization of this solenoid moves the rolls 35 into engagement with the rolls 35a and starts the feeding of the foil fromthe rolls toward the mandrel. The rate of feed of foil from the rolls is substantially equal to the rate at which the paper and foil are being wrapped on the manates in the same manner as the construction shown in Figs. 2 to 6 inclusive described above, and different from the previously described construction in features which facilitate the loading of tap straps.

The tap strap ejector has a channel-shaped frame having a vertical back wall I53 and top and bottom walls I53 and I54. The front wall 1 mit the loading and unloading of the tap straps.

As in the previously described construction, the

' stack of tap straps is pressed downward by coil springs I66 arranged between the topwail I53 andthe upper side of a pressure bar IBI. The lower ends of the springs I60 surround studs I63 on the pressure bar which prevent buckling of the springs. Adjacent the front edge of the bottom wall I54 is a slot I63 slidably receiving a bearing I64 for a shaft I65 carrying friction rolls I66. The vertical position of the friction rolls I66 is adjusted by means of an adjusting stud I61 threaded in the bottom wall I54. The stud is held in the adjusted position by a lock nut I68. By this means the rolls may be shifted up and down so that the top surface of the rolls is spaced from the edge I63 of the front plate I55 a distance greater than the thickness of one tap strap but less than the thickness of two tap straps.

drel. Due to the time delay between the foil 7 cutting and the starting of the foil feeding, a gap is provided between the adjacent'ends of the foil. When the approximate center of the gap between the severed ends of the foils is opposite the paper cutting knives II, the member I3I engages the spring contact I36 and ener izes the paper cutting solenoid 16. This causes the spring contact I33 long enough for the cutting;

operation to take place, after which it-moves clear of the spring contact I33, deenergizing the solenoid 16. The rack I4 is then returned by the spring 11 to the position illustrated. About the same time as the operation of the P per cutters 'II, the member I4I engages the spring contact III! and closes the circuit through the paper feeding solenoid 53. The energization of this solenoid causes the roll 32 to be moved into engagement with the roll 32a, thereby feeding the paper downward toward the mandrel at the same rate as the foil. Since the paper was severed at the approximate center of the gap between the adjacent ends of the foil, both ends of the paper overlap the respective ends of the foil to provide the necessary insulation. The foil and paper feeding continue until the lower ends are a short distance below the mandrel, at which time the member I43 engages the spring contact I and closes the circuit to the solenoid 28. The operation of the solenoid 28 opens the contacts 21 in the holding circuit; of the motor control solenoid I la, deenergizing the solenoid Na and thereby stopping the motor by opening the contacts ll.

The tap strap ejector shown in Fig. 'l oper- In a machine,forwinding'condensers havwise direction position.

As in the previously described construction, the

friction rolls I66 are closer to the front plate I55 than to the back wall I52. When the friction rolls are rotated in a clockwise direction, the lowermost tap strap is frictionally gripped by the rolls and ejected through the slot between the top surface of the rolls and the edge I69 of the front plate I55. The tap strap ejector is conditioned for the succeeding operation by rorack I4 to be moved to the right,rotating the'f fjtating the friction rolls 166 in -a counterclockknives 'II through the gears I3 and 15. The

member I31 remains in engagement with the v to return the rolls to the initial What I claiml asnew in desiretosecure by Letters Patent of theUnited States is:

ing provisions for feeding strips of material along spaced paths to winding meanfsga tap strap ejector comprising a framearra zed between adjacent paths for holding a stack oftap straps extending transverse to said-paths, means engaging the ends of the stackYfor'fcompressing the stack therebetween, said means including a friction roll at one end of thesta'ck, means engaging the edges of the stack for retaining therein all except the tap strap in contact with said roll, and means for rotating said roll to move the tap strap in contact therewith offthe stack.

2. In a machine for winding condensers having provisions for'feeding stripsof. material along spaced paths to winding means, a tap strap ejector comprising a framearranged between adjacent paths for holding a stack of tap straps extending transverse to said paths, means engaging the ends of the stack adjacent the front edges thereof for compressing the stack therebetween and causing the tap straps to broom at the rear edges of the stack, said means including a friction member at one end of the stack, means cooperating with the front edge of the stack for retaining therein all except the tap strap in contact with said member, and means for moving said member in a direction to move the tap strap in contact therewith off the stack.

3. In a machine for winding condensers having provisions for feeding strips of material along spaced paths to winding means, a tap strap ejector arranged between adjacent paths for holding a tap strap in a position such that the length of the tap strap is transverse to said paths, and means for ejecting the tap strap transverse to its length. 1

4. In a machine for winding condensers having provisions for feeding strips of material along spaced paths to winding means, a tap strap ejector-arranged between adjacent paths for holding a tap strap in a position such that the length of the tap strap is transverse to said paths, and means for ejecting the tap strap transverse to its length, said means including a friction wheel engaging the tap strap and means for rotating the wheel.

5. In a machine for winding condensers, means for feeding strips of material along spaced vertical paths to winding means, means for holding a tap strap in a horizontal position between adjacent paths with the tap strap extending transverse to the paths, and means for ejecting said tap strap horizontally toward one of said paths.

6. In a machine for winding condensers, means for feeding strips of material along spaced verticaltpaths to winding means, means for holding a stack of tap straps in a horizontal position between adjacent paths with the tap straps extending transverse to the paths, a friction member engaging the tap strap at oneend of the stack strap for ejecting said tap strap horizontally toward one of said paths while the material is being fed to the winding means, and means for retaining in the stack the tap straps out of contact with said friction member.

'7. In a machine for winding condensers having provisions for feeding strips of material along spaced paths to winding means, a tap strap ejector comprising a frame arranged between adjacent paths for holding a stack of tap straps extending transverse to said paths, means engaging the ends of the stack for compressing the stack therebetween, said means including a, friction member at one end of the stack, means cooperating with said friction member to define a slot of sufficient width to permit the passage of one tap strap but of insufficient width to permit the passage of more than one tap strap, and means for moving said friction member to eject through said slot the tap strap in contact therewith.

8. In a machine for winding condensers having provisions for feeding strips of material along spaced paths to winding means, a tap strap ejector comprising a frame arranged between adjacent paths for holding a stack of tap straps extending transverse to said paths. a friction roll engaging one end of said stack adjacent the front edge of the stack, a member engaging the other end of the stack, said member tapering away from the stack from the front toward the rear edge of the stack, a plate cooperating with the friction roll to define a slot at the front edge of the stack having a width greater than the thickness of one tap strap but less than the thickness of two tap straps, and means for rotating the roll in a direction to eject the tap strap in contact therewith through said slot.

CLIFFORD S. WEST. 

